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Sanborn Fire Insurance Maps are large scale street plans produced by the Sanborn Fire Insurance company from 1867 to 1970. Sanborn maps show the outline of each building including the location of windows and doors together with street names, street and sidewalk widths, property boundaries, building use, and house and block numbers. These maps are used by a wide range of researchers including local historians to locate and identify buildings and neighborhoods, urban historians to study the growth of towns and cities, and environmentalists concerned about impact of new developments.